A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.

AT&T CEO Ralph de la Vega said in an interview this week that a smaller SIM card is a "no-brainer" and his company is looking into it, but declined to make the direct connection to Apple that the ...

These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.

On April 29, SK Telecom announced that it would implement a "SIM format" method, which changes the SIM card software, to achieve the same effect as physically replacing the SIM card without actually ...

NM Cards are the exact size and shape of a Nano SIM card and go in one of the dual-SIM slots NM Cards are the exact size and shape of a Nano SIM card and go in one of the dual-SIM slots ...

With smartphones, where Apple leads others often follow - so it launching an iPhone this week without a traditional Sim card is raising questions over the future of a very familiar piece of phone tech ...

Before Molly Last traveled to Greece to volunteer at a cat sanctuary, she ran the numbers for her phone. Should she get a SIM card or an international roaming plan? A calling plan for her iPhone would ...

All iPhones and iPads with cellular have a slot on their sides that houses the Subscriber Identity Module (SIM) card provided by your mobile carrier. The SIM card enables your device to access the ...

With smartphones, where Apple leads others often follow - so it launching an iPhone this week without a traditional SIM card is raising questions over the future of a very familiar piece of phone tech ...